System of electrical distribution.



PA'I'EHI'BD SEPT. 1, 1908. M. 0. TROY. SYSTEM OF ELECTRICALDISTRIBUTION.

APPLIOATIOI FILED NOV. 11, 1906. BEIEWBD FEB. 24, 190B.

Witnesses Ihvenior: 9/ M mathew'orrm Q i rect current may UNiTED srarssrArENr orrron.

rwrrnnw o. TROY, or sonasse'ra'ur, NEW roan,

, COMPANY, A oonronarron or Agpi'mqflbn megrovember 11, 1905, sees no.

To all whom it may concern:

Be it known that 1, hlATTilEW ()."lnor, a citizen of the United States,residing at Schenectady, county of Schenectady, tate of New 5 York, haveinvented certain new and uselu Improvements in S stems of ElectricalDistribution, of which the following is a spec-itication.

My present invention relates to a novel '10 means whereby alternatingcurrent. may be converted into direct current mulled to adistributionoircuit. 'More especially, my invention relates to meanswhereby a high voltage const ant dibe obtained from a constant otentialalternating current system. Where the ordinary constant currenttransformer with relatively movable coils is employed l or this purpose,i

insulation diilieultics and the like occur where it is desired to employextremely high voltages, such as 25,000 volts and upwards, in the.secondary circuits 'lo obviate these troubles, l have devised a s s ten"'n which the current transformation is transformers oi tire-tam stantpotential type, which t-ransl'orm'crs may more readilybe insulated forthe high voltages with relatively mov able eoils.- 'lo secure thedesired constant current regulation I provide the supply circuit for thetransformers with constantcurrent rcgulating devices. Also, instead ofemploying one secondary to supply the total alternating voltage to therectilicr used for changing the: alternating. currentinto directcurrent, use a number of sccoinlariesand I connect them with theircorrespomling 'rectiliers so as to add their voltages together andtherebys'up ply a resulting very high voltage to the consum)tioncircuit. 1 thereby obtain the desire voltage on the consumptioncircuit by combining' the voltages of a number of secondaries, h ofwhich secondaries may be readily insu atcd and otherwise protected. aainst' the electric stresses of a voltage, w iich'is only a part ofthatwhieh would be necessary in ease/a single secondary were employed tosupply the total voltage. The novel features which characterize myinvention 1" have pointed out withparticu- Specification 61 LettersPatent.

28 6330. Renewed February 24:,

ASSLUNO'R TO GENERAL ELECTRIC NEW YORK.

SYSTEM OF ELECTRICAL DISTRIBUTION.

' Patented 'Septfl, 1 908.

1908.. Serial No. 417,898.

'larity in the appended claims. The, invention itself, however, will bebcttcr understood by reference to thefol lowing description taken inconnection with the accompanying drawings, which re ircsentdiagrammaticallyone emhodin .czitwliic-h my i av cntion'may assume inpractice. 7

in the. drawings. 1 have by way of illustration, shown my invention. asapplied to a mull iphase alternating current system. The systemhcrechosen isol thethree-phase type, the supply mains of which areindicated at] 2 and 3. ('urreut from-these mains is fed to an ordinarythree-phase. transformer, or to three single-phase transformersconnected together in any usual manner to receive. the three-phasecurrent from the supply system. he primaries are here indicated m4, 5and U and, by way otillustration, are shown. connected in delta. Theleads by which current is supplied to these primaries are indicated atT, S and t). i -r in order ,to produce the desired constant currentregulation ol" the system so that the secondaries may supply current ofconstant value, I, connect constant current regulating devices in. the.supply leads going to the transl'ormcrs. in the present instance I findit convenient to connect these devices with two of the main leads onlysince the other lead, serving as a return for the lirst two, need not beso provided. ,Any suitable regulating means may be cm )loyed, though forpurposes ol" illustration h ave represented in the drawings a regu atorconsisting of a three legged core 10 having coils 11 and. 12mechanically connected togetheras by a crossbar 13 and movablelengthwise over the respective outside core lcgs-14 and 15. The coilsare balanced against the magnetic pull otthe combination by any suitablemeans, such as" a "pivoted couuterweight lever 16. The coils ll and 12before mentioned, are connected res pcctivela in series with the supplyleads 7 and 8. onstancy of current is maintained by the relativemovement be tween the coils 11, lland the core member 10. Thus, anincrease in current is counteracted by an increased attraction betweenthe 100 eoils'and the core, which thereby move into better inductiverelation to each other and,

consists of a highly exhausted lass rcceptacle or' envelop, sometimescal ed a tube, provided with a-plurality of main anodes, a cathode,usually of mercury, and a plurality of starting and main'tainim anodesarranged adjacent to the cathode. Thus for example, in the rectifier 2 0the main anodes are indicated at 23, and 24, the cathode at 25, and thestarting-qr auxiliary anodes at 26 and 27.

In connecting-up the rectifiersin circuit they are arranged so as to addtogether their rectified voltages and supply the same to a commonconsumption circuit. the main anodes-ofea'ch rectifier are connecteddirectly td the secondary coil towhich they correspond-, }while thecathode of the rectifier is co fected to an intermediate p oint inthea'dj'acent secondary of the series.

bus the outside terminals of the secondary 17 are connected to theanodes 23 and 24,

.rectifier' is connected to the middle point of supply mains 1, 2 an 3.

while the cathode'25 is connected to the middle point of the secondary19 The terminals of thislatter secondary are simi- -larly connected tothe' anodes 28 and 29 of the rectifier 22, while the cathode 30 of thisthe secondary 18, This secondary is connectedto the rectifier 21. Theconsumption circuit 31, including a series of arc lamps or 1s connectedbetween the cathode 32 the like, of the remaining rectifier 21 and themiddle point of the first mentioned secondary 17.

-= An inductance coil 33 is connected in series with the consumptioncircuit in order to smooth 'out the-current waves and at the same timeto-producc an overla in the current waves l'rom the anodes of therespective rectifiers and thereby enable them to main-' tam-continuousrectifying arcs;

In order to start up each rectifier, I have I provided the startinganodes before mentioned. Thus in the starting anodes 26 and 27 areconnected .tion circuit fed by the rectified current from the case ofthe rectifier 20 to the secondary 34 of asmall constant potentialexcitin transformer, the prima ".35 .of which may -A lead 36 extends'from the middle of the secondary- 34 to the cathode 25 and includes inseries there-With an inductance 37. If now the rectifier 20 be shakenortilted so as to cause momentary To this ende sup, lied from a pair 0theexciting transformers 38 and 39 with their adjunctive devices inconnection, for startmg the corresponding rectlfiers.

.The starting means for each rectifier being set into operation, therectifiers start into;

operation and supply current to the consumption circuit 31. Theinductance coil 33 may then enable the rectifiers to operateindependently of their starting arcs by causing overlapping current Wavesbetween the anodes of the respective rectifiers. The starting circuitsand exciters for the respective rectifiers may then, if desired, bedisconnected, though I sometimes prefer to leave them in operation toprovide against anyinterruption or violent currentfiuctuations which mayoccurin the consumption circuit.

It is evident that various modifications may be made 111 theconstruction and mode of application of my invention, -for which .reasonI do not wish to be limited to the.pre-

cise details shown and described.

\Vhat I claim as new and desire to secure by Letters Patent of theUnited States, is,

1. The combination of a source of multiphase, constant-potential,alternating current, constant. ote'ntial transformer primary windingssupp ied with-current front-said source, a constant current regulatorfor the leads of saidprimary windings, secondar wmdmgs, a rectifier foreach secondary win ing', connections inter-linking the'rectifiers inseries, and a consumptioncircuit traversed by the current flowingthrough said recti tiers. Y 2. The combination of a plurality ofconstantpotential transformer primaries and secondaries, means for supplying aconstant current to said irimaries, rccti ers for said secondaries, eachof said rect-ifife'rs a plurality of positive electrodes anda-singlenegative electrode, connections interlinking the rectified circuits inseries,- and a consumpsaid rectifiers.

, '3. The combination of a constant potential alternating currentsource; leads extending therefrom, a I constant cur-rent {regulatoroperative-1y related to said leadsitransformer rimaries supplied withcurrent from said heads, second aries operativel'y'related to saidcontact between the mercury of: the starting untlary, and a negativeeleetrmle connected 2 Y MATTHEW O. TROY: in the neutral wire ol' anotherseenntlnr y, antl 1.055052 eurrent 'eonsumnig means eunneetetl be-BEN-M3113 B. lIt'LL,

primaries, each of said secondaries being pr'onry and the negativeelectrode ofone uf'the vided with a neutral connection. a rectifier lreetiliers. '10 for each seeumlm'y huvin; positive 'elee- In witnesswhereof I have hereunto setmy trmles eunneetetl t0 the terminals ofSilltl sec--' hand this 10th rim of November, 1905.

tween the neutral cunneuien of one SCCUI'Hll BERTHA S'Econ.

